composer require fond-of-spryker/sales-newsletter-signup
####Register
CustomerIpQuoteTransferExpanderPlugin() in QuoteDependencyProvider => getQuoteTransferExpanderPlugins()
CustomerOptInOutUrlQuoteTransferExpanderPlugin() in QuoteDependencyProvider => getQuoteTransferExpanderPlugins()
NewsletterSignupOrderExpanderPlugin() in SalesDependencyProvider => getOrderExpanderPreSavePlugins()